SWISS FOUNDATION PRO SENECTUTE. (1989). OLD AGE IN SWITZERLAND. SWISS FOUNDATION PRO SENECTUTE.
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Dyfyniad Arddull Chicago
SWISS FOUNDATION PRO SENECTUTE. OLD AGE IN SWITZERLAND. ZURICH (CH): SWISS FOUNDATION PRO SENECTUTE, 1989.
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Dyfyniad MLA
SWISS FOUNDATION PRO SENECTUTE. OLD AGE IN SWITZERLAND. SWISS FOUNDATION PRO SENECTUTE, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.